Get error when try to start workflow with PowerShell

We are using SP2016 on-premise. I setup a list workflow (Designer 2010 workflow) to send email to “assigned to” field in the item. Then I prepared a PowerShell script to loop thru the list and start workflow on each item if the status=Active.

However, whenever I tried the same PowerShell error returned.

Exception calling “StartWorkflow” with “3” argument(s): “Unable to synchronously deliver start event via a manual-start workflow.”

Here is part of my PowerShell script:

$  web = Get-SPWeb $  weburl -AssignmentCollection $  spAssignment  $  site = Get-SPSite $  siteurl $  listToloop = "Issues"; $  web.AllowUnsafeUpdates = $  true; $  wfToStart= "sendemail" $  list = $  web.Lists[$  listToloop];   $  manager=$  site.WorkFlowManager $  association=$  list.WorkFlowAssociations | where {$  _.Name -eq $  wfToStart} $  association.AllowAsyncManualStart = $  true $  association.AllowManual = $  true  foreach ($  item in $  list.Items) {  $  Lookup = new-object Microsoft.SharePoint.SPFieldLookupValue($  Item["Status"])     if ($  Lookup.LookupValue -eq "Active") {         $  data=$  association.AssociationData         $  wf=$  manager.StartWorkFlow($  item,$  association,$  data)         Write-Output "$  wftoStart started on " $  item.Name | Out-File $  outFile -Append             }         else {         Write-Output $  item.Name " - is completed " | Out-File $  outFile -Append         }     } 

If all the items status are not equal to “Active”, no error. For each item with status = “Active”, the same error will throw repeatedly.